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<!DOCTYPE html><html><head><title>PanResponder</title><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><meta name="viewport" content="width=device-width"><meta property="fb:app_id" content="1677033832619985"><meta property="fb:admins" content="121800083"><meta property="og:site_name" content="React Native"><meta property="og:title" content="PanResponder"><meta property="og:url" content="https://facebook.github.io/react-native/index.html"><meta property="og:image" content="https://facebook.github.io/react-native/img/opengraph.png"><meta property="og:description" content="A framework for building native apps using React"><meta name="twitter:site" content="@reactnative"><meta name="twitter:card" content="summary_large_image"><meta property="og:type" content="website"><base href="/react-native/"><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"><link rel="shortcut icon" href="img/favicon.png?2"><link rel="stylesheet" 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href="docs/appstate.html">AppState</a></li><li><a style="margin-left:10px;" class="" href="docs/asyncstorage.html">AsyncStorage</a></li><li><a style="margin-left:10px;" class="" href="docs/backandroid.html">BackAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/backhandler.html">BackHandler</a></li><li><a style="margin-left:10px;" class="" href="docs/cameraroll.html">CameraRoll</a></li><li><a style="margin-left:10px;" class="" href="docs/clipboard.html">Clipboard</a></li><li><a style="margin-left:10px;" class="" href="docs/datepickerandroid.html">DatePickerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/dimensions.html">Dimensions</a></li><li><a style="margin-left:10px;" class="" href="docs/easing.html">Easing</a></li><li><a style="margin-left:10px;" class="" href="docs/geolocation.html">Geolocation</a></li><li><a style="margin-left:10px;" class="" href="docs/imageeditor.html">ImageEditor</a></li><li><a style="margin-left:10px;" class="" href="docs/imagepickerios.html">ImagePickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/imagestore.html">ImageStore</a></li><li><a style="margin-left:10px;" class="" href="docs/interactionmanager.html">InteractionManager</a></li><li><a style="margin-left:10px;" class="" href="docs/keyboard.html">Keyboard</a></li><li><a style="margin-left:10px;" class="" href="docs/layoutanimation.html">LayoutAnimation</a></li><li><a style="margin-left:10px;" class="" href="docs/linking.html">Linking</a></li><li><a style="margin-left:10px;" class="" href="docs/nativemethodsmixin.html">NativeMethodsMixin</a></li><li><a style="margin-left:10px;" class="" href="docs/netinfo.html">NetInfo</a></li><li><a style="margin-left:10px;" class="active" href="docs/panresponder.html">PanResponder</a></li><li><a style="margin-left:10px;" class="" href="docs/permissionsandroid.html">PermissionsAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/pixelratio.html">PixelRatio</a></li><li><a style="margin-left:10px;" class="" href="docs/pushnotificationios.html">PushNotificationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/settings.html">Settings</a></li><li><a style="margin-left:10px;" class="" href="docs/share.html">Share</a></li><li><a style="margin-left:10px;" class="" href="docs/statusbarios.html">StatusBarIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/stylesheet.html">StyleSheet</a></li><li><a style="margin-left:10px;" class="" href="docs/systrace.html">Systrace</a></li><li><a style="margin-left:10px;" class="" href="docs/timepickerandroid.html">TimePickerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/toastandroid.html">ToastAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/vibration.html">Vibration</a></li><li><a style="margin-left:10px;" class="" href="docs/vibrationios.html">VibrationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/layout-props.html">Layout Props</a></li><li><a style="margin-left:10px;" class="" href="docs/shadow-props.html">Shadow Props</a></li></ul></div></div></div><div class="inner-content"><a id="content"></a><h1><a class="anchor" name="panresponder"></a>PanResponder <a class="hash-link" href="docs/panresponder.html#panresponder">#</a></h1><div><div><p><code>PanResponder</code> reconciles several touches into a single gesture. It makes
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single-touch gestures resilient to extra touches, and can be used to
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recognize simple multi-touch gestures.</p><p>By default, <code>PanResponder</code> holds an <code>InteractionManager</code> handle to block
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long-running JS events from interrupting active gestures.</p><p>It provides a predictable wrapper of the responder handlers provided by the
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<a href="docs/gesture-responder-system.html" target="_blank">gesture responder system</a>.
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For each handler, it provides a new <code>gestureState</code> object alongside the
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native event object:</p><div class="prism language-javascript">onPanResponderMove<span class="token punctuation">:</span> <span class="token punctuation">(</span>event<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span><span class="token punctuation">}</span></div><p>A native event is a synthetic touch event with the following form:</p><ul><li><code>nativeEvent</code><ul><li><code>changedTouches</code> - Array of all touch events that have changed since the last event</li><li><code>identifier</code> - The ID of the touch</li><li><code>locationX</code> - The X position of the touch, relative to the element</li><li><code>locationY</code> - The Y position of the touch, relative to the element</li><li><code>pageX</code> - The X position of the touch, relative to the root element</li><li><code>pageY</code> - The Y position of the touch, relative to the root element</li><li><code>target</code> - The node id of the element receiving the touch event</li><li><code>timestamp</code> - A time identifier for the touch, useful for velocity calculation</li><li><code>touches</code> - Array of all current touches on the screen</li></ul></li></ul><p>A <code>gestureState</code> object has the following:</p><ul><li><code>stateID</code> - ID of the gestureState- persisted as long as there at least
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one touch on screen</li><li><code>moveX</code> - the latest screen coordinates of the recently-moved touch</li><li><code>moveY</code> - the latest screen coordinates of the recently-moved touch</li><li><code>x0</code> - the screen coordinates of the responder grant</li><li><code>y0</code> - the screen coordinates of the responder grant</li><li><code>dx</code> - accumulated distance of the gesture since the touch started</li><li><code>dy</code> - accumulated distance of the gesture since the touch started</li><li><code>vx</code> - current velocity of the gesture</li><li><code>vy</code> - current velocity of the gesture</li><li><code>numberActiveTouches</code> - Number of touches currently on screen</li></ul><h3><a class="anchor" name="basic-usage"></a>Basic Usage <a class="hash-link" href="docs/panresponder.html#basic-usage">#</a></h3><div class="prism language-javascript"> componentWillMount<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>_panResponder <span class="token operator">=</span> PanResponder<span class="token punctuation">.</span><span class="token function">create<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // Ask to be the responder:
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</span> onStartShouldSetPanResponder<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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onStartShouldSetPanResponderCapture<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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onMoveShouldSetPanResponder<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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onMoveShouldSetPanResponderCapture<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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onPanResponderGrant<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // The gesture has started. Show visual feedback so the user knows
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</span> <span class="token comment" spellcheck="true"> // what is happening!
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</span>
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<span class="token comment" spellcheck="true"> // gestureState.d{x,y} will be set to zero now
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</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
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onPanResponderMove<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // The most recent move distance is gestureState.move{X,Y}
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</span>
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<span class="token comment" spellcheck="true"> // The accumulated gesture distance since becoming responder is
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</span> <span class="token comment" spellcheck="true"> // gestureState.d{x,y}
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</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
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onPanResponderTerminationRequest<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token boolean">true</span><span class="token punctuation">,</span>
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onPanResponderRelease<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // The user has released all touches while this view is the
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</span> <span class="token comment" spellcheck="true"> // responder. This typically means a gesture has succeeded
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</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
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onPanResponderTerminate<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // Another component has become the responder, so this gesture
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</span> <span class="token comment" spellcheck="true"> // should be cancelled
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</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
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onShouldBlockNativeResponder<span class="token punctuation">:</span> <span class="token punctuation">(</span>evt<span class="token punctuation">,</span> gestureState<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // Returns whether this component should block native components from becoming the JS
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</span> <span class="token comment" spellcheck="true"> // responder. Returns true by default. Is currently only supported on android.
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</span> <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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render<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token punctuation">(</span>
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<View <span class="token punctuation">{</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token keyword">this</span><span class="token punctuation">.</span>_panResponder<span class="token punctuation">.</span>panHandlers<span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span>
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<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span></div><h3><a class="anchor" name="working-example"></a>Working Example <a class="hash-link" href="docs/panresponder.html#working-example">#</a></h3><p>To see it in action, try the
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<a href="https://github.com/facebook/react-native/blob/master/RNTester/js/PanResponderExample.js" target="_blank">PanResponder example in RNTester</a></p></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="docs/panresponder.html#methods">#</a></h3><div class="props"><div class="prop"><h4 class="methodTitle"><a class="anchor" name="create"></a><span class="methodType">static </span>create<span class="methodType">(config)</span> <a class="hash-link" href="docs/panresponder.html#create">#</a></h4><div><p>@param {object} config Enhanced versions of all of the responder callbacks
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that provide not only the typical <code>ResponderSyntheticEvent</code>, but also the
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<code>PanResponder</code> gesture state. Simply replace the word <code>Responder</code> with
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<code>PanResponder</code> in each of the typical <code>onResponder*</code> callbacks. For
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example, the <code>config</code> object would look like:</p><ul><li><code>onMoveShouldSetPanResponder: (e, gestureState) => {...}</code></li><li><code>onMoveShouldSetPanResponderCapture: (e, gestureState) => {...}</code></li><li><code>onStartShouldSetPanResponder: (e, gestureState) => {...}</code></li><li><code>onStartShouldSetPanResponderCapture: (e, gestureState) => {...}</code></li><li><code>onPanResponderReject: (e, gestureState) => {...}</code></li><li><code>onPanResponderGrant: (e, gestureState) => {...}</code></li><li><code>onPanResponderStart: (e, gestureState) => {...}</code></li><li><code>onPanResponderEnd: (e, gestureState) => {...}</code></li><li><code>onPanResponderRelease: (e, gestureState) => {...}</code></li><li><code>onPanResponderMove: (e, gestureState) => {...}</code></li><li><code>onPanResponderTerminate: (e, gestureState) => {...}</code></li><li><code>onPanResponderTerminationRequest: (e, gestureState) => {...}</code></li><li><p><code>onShouldBlockNativeResponder: (e, gestureState) => {...}</code></p><p>In general, for events that have capture equivalents, we update the
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gestureState once in the capture phase and can use it in the bubble phase
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as well.</p><p>Be careful with onStartShould* callbacks. They only reflect updated
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<code>gestureState</code> for start/end events that bubble/capture to the Node.
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Once the node is the responder, you can rely on every start/end event
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being processed by the gesture and <code>gestureState</code> being updated
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accordingly. (numberActiveTouches) may not be totally accurate unless you
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are the responder.</p></li></ul></div></div></div></span></div><p class="edit-page-block">You can <a target="_blank" href="https://github.com/facebook/react-native/blob/master/Libraries/Interaction/PanResponder.js">edit the content above on GitHub</a> and send us a pull request!</p><div class="docs-prevnext"><a class="docs-prev" href="docs/netinfo.html#content">← Prev</a><a class="docs-next" href="docs/permissionsandroid.html#content">Next →</a></div></div></section><footer class="nav-footer"><section class="sitemap"><a href="/react-native" class="nav-home"><img src="img/header_logo.png" alt="React Native" width="66" height="58"></a><div><h5><a href="docs/">Docs</a></h5><a href="docs/getting-started.html">Getting Started</a><a href="docs/tutorial.html">Tutorial</a><a href="docs/integration-with-existing-apps.html">Integration With Existing Apps</a><a href="docs/more-resources.html">More Resources</a></div><div><h5><a href="/react-native/support.html">Community</a></h5><a href="/react-native/showcase.html">Showcase</a><a href="http://www.meetup.com/topics/react-native/" target="_blank">Upcoming Events</a><a href="https://www.facebook.com/groups/react.native.community" target="_blank">Facebook Group</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a></div><div><h5><a href="/react-native/support.html">Help</a></h5><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Stack Overflow</a><a href="https://discord.gg/0ZcbPKXt5bZjGY5n">Reactiflux Chat</a><a href="/react-native/versions.html" target="_blank">Latest Releases</a><a href="https://react-native.canny.io/feature-requests" target="_blank">Feature Requests</a></div><div><h5>More</h5><a href="/react-native/blog">Blog</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://facebook.github.io/react/" target="_blank">React</a></div></section><section class="newsletter"><div id="mc_embed_signup"><form action="//reactnative.us10.list-manage.com/subscribe/post?u=db0dd948e2b729ee62625b1a8&id=47cd41008f" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate><div id="mc_embed_signup_scroll"><label for="mce-EMAIL"><h5>Get the React Native Newsletter</h5></label><input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder="email address" required><div style="position:absolute;left:-5000px;" aria-hidden="true"><input type="text" name="b_db0dd948e2b729ee62625b1a8_47cd41008f" tabindex="-1" value=""></div><div class="clear"><input type="submit" value="Sign up" name="subscribe" id="mc-embedded-subscribe" class="button"></div></div></form></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"></a><section class="copyright">Copyright © 2017 Facebook Inc.</section></footer></div><div id="fb-root"></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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